l6 POLYPODIUM INCANUM. HOARY POLYPODY. 



unfold as in the unrolling of a coil. This latter mode is a very- 

 beautiful form of growth, and the artist has happily caught our 

 specimen in the unfolding act. 



Explanation of the Plate. — i. A portion of the scaly rhizome, with fronds showing the 



upper and lower surfaces. — 2. .'•lection of pinnule, enlarged three times, and showing the 

 sori and scales. 



